14-11-14, 06:16 PM
Mostly the batteries have a problem. And usually people hold on to the voltage they've taken and claim their battery is okay.
The reading of 15V is definitely too high and not possible with this type of battery. I would blame it to the multimeter.
A fully charged battery reads 13.8V, when connected to a charger. As soon as it rests for a while the voltage drops to somewhere between 12.5 and 12.8V. Have observed this many times when charging my battery during winter. And this is also on par with the manual. It says to wait for 30 minutes after charging for the final voltage to settle.
So far so good.
To determine the condition your only information is based on the voltage at the terminals. This does not say anything about the inner status of the 6 individual cells and their respective capacity. One weak cell is enough to cause trouble. You need to take a complete discharge measurement to make a valid statement. I guess this is beyond the capabilities of most of us.
If the battery is proven to be fine (because new) I would investigate the starter. Typically they fail bit by bit. At certain positions they might have a problem, not able to provide the initial torque. A few degrees of rotation later all appears to be fine. Assume they have 20 or so individual coils. A single one is not working properly.
Of course these are all guesses. I don't know the history of your bike.
The reading of 15V is definitely too high and not possible with this type of battery. I would blame it to the multimeter.
A fully charged battery reads 13.8V, when connected to a charger. As soon as it rests for a while the voltage drops to somewhere between 12.5 and 12.8V. Have observed this many times when charging my battery during winter. And this is also on par with the manual. It says to wait for 30 minutes after charging for the final voltage to settle.
So far so good.
To determine the condition your only information is based on the voltage at the terminals. This does not say anything about the inner status of the 6 individual cells and their respective capacity. One weak cell is enough to cause trouble. You need to take a complete discharge measurement to make a valid statement. I guess this is beyond the capabilities of most of us.
If the battery is proven to be fine (because new) I would investigate the starter. Typically they fail bit by bit. At certain positions they might have a problem, not able to provide the initial torque. A few degrees of rotation later all appears to be fine. Assume they have 20 or so individual coils. A single one is not working properly.
Of course these are all guesses. I don't know the history of your bike.